Drier and conveyer



(No Model.)

J.H.DUNGAN. DRIER AND GONVEYER.

No. 423,598. Patented Mar. 18, 1.890.

WITNESSES 6 K W' A '1 YIIIIIIIIIIQ l V NTOR UNITED STATES PATENT OFFICE.

JOHN H. DUNCAN, or SYRACUSE, NEW YORK.

DRIER AND LCONVEYER.

SPECIFICATION forming part of Letters Patent No. 423,598, dated March 18, 1890.

Application filed January 9, 1888. Serial No. 260,122. (No model.)

To all whom it may concern:

Be it known that I, JOHN I-LDUNCAN, of Syracuse, in the county of Onondaga, in the State of New York, have invented new and useful Improvements in Driers and Conveyers, of which the following, taken in connection with the accompanying drawing, is a full, clear, and exact description.

My invention relates to an improvementin driers and conveyers; and it consists in certain peculiarities of the construction and arrangement of the same, substantially as will be hereinafter more fully described, and pointed out in the claims.

In order to enable others skilled in the art to which my invention pertains. to make and use the same, I will now proceed to describe its construction and operation, referring to the accompanying drawing, in which the figure represents a longitudinal vertical section of ,my invention.

a represents a furnace or heater of any suitable size, form, and construction, provided with the usual grate-bars a and bridgewall a No detailed description of this furnace is needed further than that here given, as its details are not material, and many such are well known and entirely suitable to use in connection with this apparatus.

Within the furnace-shell I place a coil of pipe I), having its lower end connected to a fan or blower b, and to this blower is also connecteda pipe b leading from aheating-chamher 0, in which is a steam-coil c, properly connected to any suitable steam-generator, and an air-supply c is also connected to this chamber. The upper end of the heating-coil b is connected to the pipe cl, which is extended to enter the storage-room d, as shown. An auxiliary pipe m, preferably of smaller diameter than the main one, is extended from the blower b, and is connected to the pipe d at a point just beyond its connection with the main blast-pipe b, as seen in the drawing, and while the angle of connection of the pipes m and at will vary, as may be required in particular cases, I prefer to make this connection at an acute angle, in order that the blast from the auxiliary pipe shall need as little deflection as possible on joining the main current. Over this auxiliary pipe is placed a hopper e, into which the material to be operated upon salt) from a receptacle in which it is stored,

to what is usually termed the dry-room, and to dry the material thoroughly while in transit, and the operation will be readily comprehended from the preceding description. Air is drawn through the heating-chamber c by the influence of the fan or blower, and is partially heated by contact with the steam-coil in said chamber. From the blower the main portion of the air is forced through the coil 1) in the furnace, and as the coil is in constant contact with the flames and products of combustion the airis heated to an intense degree during its passage and enters, the pipe d at an exceedingly high temperature. A portion of the air from the blower atthe same time passes through the auxiliary pipe on, and also is forced into and through the pipe d. The material to be dried andconveyed falling into the hopper 'is fed positively and evenly into the auxiliary blast- A connection f, between pipe on by the conveyer-screw f, which not proper point of deposit, and during its passage it is thoroughly dried by the heat of the blast to which it is subjected. The employment of the auxiliary-blast into which the material is first fed and its connection with the main blast at an acute angle effectually overcomes the liability toclogging at this point, which has heretofore been an annoyance in such machines, and it will be noted also that I provide the pipe-sections at this point with one or more removable portions 01 n, by means of which the interior of the pipes maybe accessible at any time without trouble main blast at once carrles 1t onward to the o and any incrustations and other obstructions removed.

It will be evident that the quantity of material handledmay be readily regulated by varying the speed of the feeding-screw f, so as to feed the damp material faster or slower, as desirable in its proper treatment.

The apparatus herein shown is well adapted to the carrying out of my invention; but I do not desire to confine myself to this peculiar construction, as it is evidentthat it may be changed in many details Without in any manner departing from the spirit of my invention.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. The combinatiomwith a hopper fol-holdingthe material, and a conveyer-pipe connected thereto,into the side of which the material is fed from the hopper, of a hot-airblast pipe connected to one end of the conveyer-pipe, whereby the material is both dried and carried away by the hot blast, substantially as and; for the purpose set forth.

2. In a drier and conveyer, the combination, with a fan or blower, and a furnace or heating device, of a pipe-coil within the furnace connected at one end to the blower and at the other to a conveyer-pipe, and means,-

ing the damp material regularly and prenected at one end to the conveyer-pipe, and a blower connected to the other end, and an auxiliary heating-chamberprovided with a steam-coil, through which air is drawn to the -blower,'substantially as and for the purpose set forth.

5. In a drier and conveyer, the combination, with a conveyer-pipe having a hot-air blast connected thereto, of an auxiliary blastpipe connected to the conveyer-pipe at an acute angle, and a hopper for feeding the materi-al to be acted upon connected to the auxiliary blast-pipe, substantially as and for the purpose set forth.

6. In a drier and conveyer, the combination, with a conveyer-pipe, and a hot-blast coil passed througha furnace for heating the air, of a blower connected thereto, an auxiliary heating-chamber from which the air is drawn to the blower, and an auxiliary blastpipe connecting the blower With-the conveyer pipe, into which the material-is fed, substantially as and for the purpose set forth.

In testimony whereof I have hereunto signed my name, in the presence of two attestingwitnesses, at Syracuse, in the county of Onondaga, in the State of New York, this 30th day of November, 1887.

- JOHN H. DUNCAN.

WVitnesses:

W. O. MCARTHUR, E. O. CANNON. 

